Skip to content

SARS-CoV-2 Nucleic Acid Detection by Qualitative Probe-Based Assay (e.g., Real-Time PCR)

Published: August 9, 2026Updated: August 16, 2026

This test checks for genetic material from the virus that causes COVID-19 in your sample. It helps determine if you have an active infection.

Quick summary

["A COVID-19 test to detect the virus’s genetic material, often used for diagnosis or monitoring exposure."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
94643-4
Short code
SARS-CoV-2 S gene Ct Spec Qn NAA+probe
Synonyms
SARS-CoV-2 S gene Ct Spec Qn NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

How the Test Works

The test uses a specialized probe to detect the virus’s genetic material (RNA) in your sample. It amplifies and measures these sequences to confirm if the virus is present. This method is highly sensitive and specific for SARS-CoV-2.

What Sample Is Used?

This test typically uses a nasal or throat swab sample collected from you. The swab collects cells and fluids where the virus may be present, allowing the test to detect its genetic material.

When Might You Need This Test?

You may receive this test if you have symptoms of COVID-19, have been exposed to someone with the virus, or are required for travel, work, or school purposes. It is also used to monitor recovery or assess ongoing risk.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications (like antibiotics) that could affect results. Wear a mask if you have respiratory symptoms to prevent spreading germs.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test plays a critical role in identifying active COVID-19 infections. It helps healthcare providers make decisions about treatment, isolation, or contact tracing. Early detection can prevent the spread of the virus and guide appropriate medical care.

Short name

SARS-CoV-2 RNA Test (Qualitative)

Frequently asked questions

Why was I asked to take this test?
Your healthcare provider or facility may have recommended this test due to symptoms, exposure risk, or regulatory requirements. It helps ensure you’re safe and informs decisions about your health or others around you.
What does a positive result mean?
A positive result indicates the presence of the virus’s genetic material, suggesting you likely have an active COVID-19 infection. Follow your healthcare provider’s guidance on next steps, such as isolation or treatment.
Can I get this test at home?
Some at-home COVID-19 tests detect the virus similarly but may not use the same advanced probe-based method. Always confirm with your healthcare provider or lab about the specific test used and its accuracy.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy